This part of the IEC 62453-51, which is a Technical Report, provides additional information for integrating the FOUNDATIONTM Fieldbus1 (FF) protocol into the COM-based implementation of the FDT Specification (IEC TR 62453-41). This document describes communication definitions, protocol specific extensions and the means for block (e. g. transducer, resource or function blocks) representation. The protocol specific definitions are based on FF-Specifications for H1 and HSE protocols. Furthermore, the definitions contain information that is needed by systems to configure FF devices. The scope is limited to Foundation Fieldbus device and system-specific definitions. This part of IEC 62453 specifies implementation of communication and other services based on IEC 62453-301. This document neither contains the FDT specification nor modifies it.